<template>
    <div class="app-container">
        <!--顶部Header区域-->
        <mt-header fixed title="Vue项目">
            <span slot="left" @click="goBack" v-show="backflag">
                <mt-button icon="back">返回</mt-button>
            </span>
        </mt-header>

        
       
       <!-- 中间的路由 router-view区域  -->

        <transition>
            <router-view></router-view>    
        </transition>
        



       <!--底部 tabbar区域-->

       <nav class="mui-bar mui-bar-tab">
			<router-link class="mui-tab-item-lib" to="/home">
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="mui-tab-item-lib" to="/member">
				<span class="mui-icon mui-icon-contact"></span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="mui-tab-item-lib" to="/shopcar">
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart"><span class="mui-badge" id="badge">{{$store.getters.getAllCount}}</span></span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="mui-tab-item-lib" to="/search">
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>
    </div>
</template>
<script>


export default {
    data() {
        return {
            backflag: false
        }
    },
    created() {
        //页面path没有改变，刷新之后，其他的tabbar页面，back按钮消失了，所以，要在created钩子函数中再设置一下
        if(this.$route.path=== "/home"){
            this.backflag = false;
        }else {
            this.backflag = true;
        }
    },
    methods:{
       goBack() {
           //点击后退，返回按钮
           this.$router.go(-1)
       }
            
    },
    watch: {
        '$route.path': function(newVal) {
            if(newVal === '/home'){
                this.backflag = false;
            } else{
                this.backflag = true;
            }
        }
    }
}
</script>
<style  lang="scss" scoped>
    .app-container{
        padding-top: 40px;
        padding-bottom: 50px;
        overflow-x: hidden;
    }
    .v-enter,{
        opacity: 0;
        transform: translateX(100%);
        
    }
    .v-leave-to{
        opacity: 0;
        transform: translateX(-100%);
        position: absolute;
    }
    .v-enter-active,
    .v-leave-active{
        transition: all 0.5s ease;
    }
    // 为了解决图片分享，滑动条滑动之后，路由无法切换问题，把.mui-tab-item 类名改一下
    .mui-bar-tab .mui-tab-item-lib.mui-active {
        color: #007aff;
    }
    .mui-bar-tab .mui-tab-item-lib {
        display: table-cell;
        overflow: hidden;
        width: 1%;
        height: 50px;
        text-align: center;
        vertical-align: middle;
        white-space: nowrap;
        text-overflow: ellipsis;
        color: #929292;
    }
    .mui-bar-tab .mui-tab-item-lib .mui-icon {
        top: 3px;
        width: 24px;
        height: 24px;
        padding-top: 0;
        padding-bottom: 0;
    }
    .mui-bar-tab .mui-tab-item-lib .mui-icon~.mui-tab-label {
        font-size: 11px;
        display: block;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    .mint-header{
        z-index:999;
    }
</style>


